Portable milling machine



Nov. 24, 1953 Filed Nov. 16, 1948 7- S heet s-Sheet l Gltornegg r U U Q E W H W Nov. 24, 1953 E, M RT N 2,660,096

PORTABLE MILLING MACHINE Filed Nov. 16, 1948 '7 Sheets-Sheet 2 @mzMw" M Nov. 24, 1953 H. E. MORTON I PORTABLE MILLING MACHINE Filed Nov. 16, 1948 7 Sheets-Sheet 5 inventor L Le IyEar/ 7770270/7 Gttomegs Nov. 24, 1953 E -MORTON 2,660,096

PORTABLE MILLING MACHINE Filed Nov. 16, 1948 TSheets-Sheet 4 llllIIIIIIIIlllllllfllllllllllllll I II I ll M E! HI G. 1 AL \\k\\1 ZSnnentor Gttomcgs NOV. 24, 1953 MORTON 2,660,096

PORTABLE MILLING MACHINE F iled Nov. 16, 1948 7 Sheets-Sheet 5 Z'mventor (Ittornegs Nov. 24, 1953 H. E. MORTON 2,660,096

PORTABLE MILLING MACHINE v Filed Nov. 16, 1948 7 Sheets-Sheet e Zhwentor Gttornegs Nov. 24, 1953 H. E. MORTON 2,660,096

I PORTABLE MILLING MACHINE m T y mi :Amg I i altoruelp Patented Nov. 4, 1953 OFFICE PORTABLE MILLING MACHINE Michigan Application November 16, 1948, Serial No. 30,339

Claims.

This invention relates to machine tools and, in particular to milling machines.

One object of this invention isto provide a milling machine which is adapted to be moved into position over the base or other portion of another machine to machine the base and thereby maintain it in an accurate condition, as well as to restore the base to this condition after it has become deformed during use.

Another object is to provide a portable milling machine which is attachable to and detachable from the base or other deformed portion of a machine to be remachined, without the necessity af removing the base from the foundation or otherwise dismantling the machine, the milling machine having a multiplicity of adjustments whereby it is enabled to cut an accurate surface of any desired inclination, as well as to restore a deformed surface to its original accurate condition.

Another object is to provide a milling machine of the foregoing character which is adapted to remachine the base of a machine which is subjectedto deformation under severe working conditions, for example, the base of a power. hammer, so as to maintain the hammer base 1n a perfect condition and thereby to insure that the workpieces produced by the machine will be accurate in shape and of the desired dimension.

Another object is to provide a portable milling machine of the foregoing character wherein the cutter head is mounted upon a cross-beam, the ends of which are movable to and fro along parallel guideways, adjustments being provided for moving one end or the other of the crossbeam along the guideways as well as to move the cutter head along the cross-beam so as to position it accurately relatively to the surface to be machined, the cutter head being also provided with a vertical adjustment for raising and lowering the cutter relatively to the surface to be machined.

Another object is to provide a portable milling machine of the foregoing character wherein the cutter head is provided with a power-operated feeding mechanism by which it may be fed both longitudinally and transversely relatively to the surface to be machined.

Another object is to provide a portable milling machine of the foregoing character wherein the cutter head may be shifted from one side of the cross-beam to the other or provided with an angled cutting attachment whereby the machine may cut the angled sides of a dovetail groove as well as the bottom thereof.

Another object is to provide a portable milling machine of the foregoing character which is exceptionally comp-act and low in height so that it can be readily attached to and detached from the machine to be resurfaced with a minimum of disturbance of the parts of the machine being serviced.

In the drawings:

Figure 1 is a front elevation, partly in vertical section, of a portable milling machine according to a preferred form of the invention;

Figure 2 is a top plan view, partly in horizontalsection, of the machine shown in Figure 1;

Figure 3 is a right-hand end elevation of the machine shown in Figures 1 and 2;

Figure 4 is a,vertical section along the line :l-A in Figure 1, showing details of the cutter head;

Figure 5 is a fragmentary front elevation of a modification of Figure 1, showing an angled cutter head for cutting vertical or inclined surfaces;

Figure dis a view similar to Figure 4 but showing the angled cutter head of Figure 5;

Figure 'l is a vertical section through the driving mechanism-unit, taken along the line 7-1 in .Figure 1;

A Figure 8 isfa vertical section through the driving mechanism unit, taken along the line 88 in Figure 7 andiat right angles to Figure 7 V Figure 9 is a horizontal section through the driving mechanism, unit, taken along the line 9-'-9 in Figure 7; I

Figure 10 is another horizontal section through the driving mechanism unit, taken along the line Figure ii is a central vertical section through the cutter head and adjacent structure taken along the line ;I I-l| in Figure 1;

Figure 12 is a vertical section through the cutter headjtaken along the line l2l2 in Figure II and substantially at right angles thereto; and

Figure 13 is a horizontal section through the cutter head and adjacent structure taken along the, line l'3,l 3 in Figure 11.

Hitherto, the upkeep of heavy duty machines subject to deformation, during use has presented a difficult problem to the user, particularly as regards the remachining of the deformed surfaces to restore them as nearly as possible to their original condition. This problem is particularly difiicult of solution with respect to the beds or bases of power hammers, especially in the case of very large power hammers, the bases of which are subjected constantlyto heavy blows during use. The remachining of such deformed surfaces has hitherto required the dismantling of the machine and the improvisation of cutting mechanisms for recutting the deformed surfaces. The problem is particularly urgent and difficult where, as is frequently the case, the surfaces to be remachined are not entirely fiat but have relatively angled portions, such as the sides and ends of dovetail grooves, sockets or recesses.

The portable milling machines of the present invention solves these problems with ease and rapidity, and without the necessity of dis-: mantling the power hammer or other machine, or of removing therefrom the bed or other pore tion which is to be remachined. The milling machine, in general, consists of horizontal parallel rails which are attachable to the so-called housings of power hammers, these horizontal rails supporting a horizontal rectangular cross-beam, the ends of which are movable to and fro along these rails. The cross-beam, in turn, carries a saddle or carriage movable horizontally lengthwise thereof and supporting a vertically movable cutter head which carries a cutter adapted to perform the machining operations on the base or the other portion to be resurfaced. The machine is provided with mechanism whereby the ends of the cross-beam may be moved horizontally along the rails, or the saddle or carriage moved horizontally along the cross-beam, both for adjustment and feeding purposes. The spindle of the machine is also adjustable vertically, and furthermore can be shifted from one side of the saddle or carriage to the other side so as to work up close to corners in a confined slot. When the re-machining has been done, the machine is easily removed.

General construction Referring to the drawings in detail, Figures 1 and 2' show a portable milling machine, generally designated l6, according to a preferred form of the invention. The milling machine H] is provided with substantially horizontal parallel rails ll mounted upon angle brackets 12, which are in turn bolted or otherwise secured to the base 13 of the power hammer or other machine la, the horizontal surface [5 of which is to be resurfaced. It is assumed that the surface I5 is subject to deformation, such as is caused by the blows of the hammer. As is frequently the case, (Figure 4) the surface it forms the bottom of a dovetail groove l6 having inclined opposite side walls l1 and I3 which also must be maintained in an accurate condition. As shown in Figure 2, the side wall l'l consists of two portions which are inclined both horizontally and vertically so as to present two relatively angled portions when viewed from above. The opposite side wall I8 is likewise angled both horizontally and vertically but consists of a single surface. It is this groove l6 which receives thev anvil or work support of the power hammer or other machine to be resurfaced. The housings l2 are in turn mounted upon the base 13 of the power hammer I l.

The upper edges of the horizontal rails H are provided with parallel guide ribs which are accurately machined and spaced apart from one another to provide a longitudinal slot 2| through which access is obtained to a screw shaft 22 which is fixed as at 23 against rotation in the opposite end walls 24 of the rails II. The rails H serve to slidably receive right-hand and lefthand sub-saddles 25 and 2-6 (Figure l) properly gibbed as at 21 and fitted for horizontal travel along these horizontal rails H. Pivotally mounted on the sub-saddles 25 and 26 in a manner more particularly described below are a driving mechanism unit and an outer swivel support bracket generally designated 28 and 29 respectively (Figures 1 and 2). These, in turn, between them support a substantially horizontal cross-beam generally designated 30 upon which travels a saddle or carriage generally designated 3|, the latter, in turn, carrying a verticallymovable cutter head, generally designated 32. In order to clamp the units 28 and 29 to their respective sub-saddles 25 and 26, the former are arcuately slotted as at 33 (Figures 2 and 9) around their pivotal axes as centers to receive studs 34 threaded into the sub-saddles 25 and 26 respectively, and carrying nuts 35 threaded thereon. The sub-saddles 25 and 26 are provided with retaining bars 36 bolted to the lower edges thereof so as to retain them in position while p r itting rec proca in mot on or trav l a o the rails ll.

Outer swivel support bracket construction The outer swivel support bracket 29 is provided with a large rectangular horizontal slot 3'! (F ure 1 through which the cross-beam 30 -a ly passes and is t ne n p a e y h top plate 33 bolted to the bracket 29, Bolted to the outer end of the crossebeam 30 is a vertical bracket 39. The inner end of the cross beam 39 is bolted to the housing 411 of the driving mechanism unit 28. Journaled at their opposite ends in the k t 3}} n hous n 4". ar upper and low s ine. shafts 4|. andv 42 esp ctiv l a a rotatable screw shaft 43. In Figure 1 a portion of the screw shaft. 43 near its left-hand end is broken away so as to disclose the lower spline shaft 42 immediately behind it. The upper spline shaft 41 transmits power to the cutter head 32 to rotate the cutter thereof. The lower spline shaft 42 serves to transmit power to the outer swivel support bracket. 29 so as to move it longitudinally along the outer rail [I as described below. The screw shaft 43, when rotated serves to move the. cutter head saddle 3| and cutter head 32 along the cross-beam 3.0.

In order to. cause the sub-saddle 2t" and outer swivel support bracket 25;. to move lengthwise along the outer rail H, the lower spline shaft 42 has mounted thereon and splined thereto a slidin-g jaw-toothed clutch. collar it. (Figure 1') engaged by a shift armlr'lmounted on a shaft 46 which, in turn, is journaled in. thev outer swivel support bracket 25! (Figure 2) and on its outer end carries a hand crank d? by which it may be shifted to and fro. The teeth of the clutch collar as are engageable with corresponding teeth on the tubular hub. 63 of a bevel pinion are which is bored for the passage of the spline shaft 52 and is journaled in a bracket extending upward from the bottom wall of the outer swivel support bracket 29. (Figure l). The bevel pinion 19 in turn meshes with a. bevel; pinion 5i mounted on a vertical shaft 52 which is journalcd in and extends downward through a. tubular pivot shaft 53 and carries on itslower end a bevel pinion 56 meshing with a bevel pinion 55 forming a part of and. integral with an internally threaded nut 55 (Figure 2) threaded upon the outer screw shaft 22 androtatably supported in a bracket 5? which extends downward through the outer slot 21 from the sub-saddle 2%. The construction of the nu 5 and bracket '5? is similar to thatshown at the very bottom of Figures? and 8subsequently to be described in connection with the driving mechanism unit 28. The tubular pivot shaft 53 (Figure l) is journaled'in co-axial bores 58 and 59 in theadjacent walls of the outer-swivel support bracket 29 and outer sub-saddle 26 respectively.

Cutter head and saddle construction The cross-beam 36 (Figure 11) is ofhollow rectangular construction so as to be as rigid as possible, and is accurately machined for the travel of the cutter head saddle 35 to and fro. The cutter head saddle it consists of a hollow housing 6i (Figures 1 and 2) through'which passes a slot 6! of rectangular cross-section accurately fitted to the machined surfaces of the cross-beam 3t. Bolted to the bottom plate .52 of the housing 60 is an internally threaded nut 63 (Figures 11 and 12) which is threadedontol the screw .shaft ii-i. .Thus; when the screw shaft it is rotated by the mechanism. within the driving mechanism unit 28, as described below, the housing st of the saddle 31 travels to and fro along the cross-beam til, carrying with it the cutter head 32. The bottom plate 62 of the housing es is bolted to the housing 60 in a manner similar to the bolting of the top plate 38 of the outer swivel support bracket 29.

ing with the gear t? is an upper gear is mounted on a shaft it which is journaled in the interior walls or partitions ill and E5 of the housing (iii, these walls being suitably bossed for that purpose as at it and ii. Mounted on the shaft M is a worm 18 which meshes with aworm gear 79 mounted on a vertical shaft as and held in position on a'reduced diameter portion thereof by a a nut '3! threaded on the threaded upper end thereof. The shaft 89 is journaled in aligned bores 32 and 83 in the housing walls or. partitions 84 and 85 respectively, and on its lower end carries a gear 86 held thereon by a retaining nut 81 threaded on the threaded lower end of the shaft Meshing with the gear 86 (Figure 11) is a gear 88 secured by the retaining nut S9.to the lower end of a vertical shaft en. The latter is journaled in a bore 95 in a bearingboss 92 extending upward from the housing partition 85 and on its upper end has a retaining nut 93 threaded thereon. The gear 88 is an idler gear which, as will be seen later, serves to transmit the drive to the cutter head 32 when the latter is moved to the opposite side of the housing as. For this purpose, the housing as on its-opposite sides is provided with vertical dovetail grooves 9 and 95 (Figure 13) closed by gibs 9E5 bolted thereto.

The housing iii of the cutter head 32 is provided along its rearward side with a dovetail portion es fitting into the dovetail groove M or at so as to slide vertically therein. Journaled in the flanged collars t9 and I iii! forming the upper and lower end plates of the housing 91 (Figure ll) is a hollow cutter spindle Iii! to which an elongated pinion 162 is keyed, the pinion Hi2 being in mesh with the gear 86 (or when the cutter head 52 is shifted to the dovetail slot 94, in

- shaft mesh with the idler gear 88). The spindle it! is also surrounded by a sleeve its having its upper end engaging the lower end of the pinion m2 and having its lower end flanged and fitting into the counterbore I64 in which the lower collar it is seated. The upper end of the sleeve E03 also engages the midportion of the hollow spindle it)! immediately below the elongated pinion I82 and gives it additional support.

The hollow spindle iti is provided with a central bore hi5 opening into a conical mouth or socket HIE at its lower end (Figure 11). Seated in the socket its is the correspondingly conical or tapered stem it! of a milling cutter Hi8 having cutting teeth ltd around the periphery of its cutting face lit. The cutter N38 is bored longitudinally at iii to receive a retaining bolt H2 which likewise passes upward through the spindle bore l and is threaded on its upper end to receive a retaining nut H3 and an additional nut H5. When the nuts H3 and its are removed, the bolt iif may be withdrawn, permitting the cutter iilt to be removed and resharpened or replaced.

Angle cutter head construction The angle cutter head I 15 (Figures 5 and 6) is generally similar to the cutter head 32 except for the construction at its lower end, and is similarly mounted in either of the dovetail grooves Sior 95. The internal construction of the angle cutter head H5 is therefore similar to that of the straight cutter head 32 as shown in Figures 11, 12 and 13, and similar parts are similarly designated. In place of the straight cutter or face cutter "28, however, the tapered hub of a bevel gear I I6 is inserted in the socket E65 of the spindle i ii! and meshes with a bevel gear i ii on a horizontal H8 journaled in an angle bracket H9 mounted on the lower end of the housing t2".

Swiveled upon the angle bracket H9 as by the pivot shaft I20 (Figure 6) is an angle cutter support l2! in which a hollow angle cutter shaft in is journaled and drivingly connected to the shaft lit by bevel gearing (not shown). The angle cutter shaft 522 (Figure 6) is also provided with a conical socket for receiving a face cutter E23 similar to the face cutter 33 used in the direct or straight cutter head 32. The support [2! may be swiveled around its pivot shaft I25. so as to place the face of the face cutter 23 at any desired angle, such as to cut the inclined side walls H and id of the dovetail groove it. Thus, the angle cutter head l is interchangeable with the straight cutter head 32 to machine surfaces pre-- sented at any angle.

Driving mechanism unit construction The driving mechanism unit 28 by which power is transmitted from a motor !25 to drive the spline shafts ll and 42 or the screw shaft 43 either simultaneously or separately in a forward or reverse direction is shown generally in Figures 1, 2 and 3 and, in detail, in Figures 7, 8, 9 and 1G. The unit 28 is provided with a housing 26 the lower end of which expands into a fiat base is? having a machined lower surface E28 resting upon the sub-saddle 25 and, as previously stated, provided with arcuate slots 33 receiving studs 34 threaded into the sub-saddle 25 and carrying lock nuts 35 on the upper ends thereof. As previously stated, the arcuate slots 33 are centered on the pivotalaxis of the housing 523 relatively to the sub-saddle 25 on which is pivots.

s The motor IE5 is mounted on the upper portion of the housing I26 and its armature shaft IE9 is connected by a coupling I38 to an. input shaft I3I (Figure 2) which is journaled in a bearin boss I82 (Figure 7) in the interior of the housin I28. Mounted on the end of the input shaft I3i are twin sprockets I83 with which mesh sprocket chains Ied extending around and meshing with twin sets of sprockets I85 and I36 resp c ively (Figure 7). The sprockets I85 are mounted on the outer end of a shaft I31 journaled in a bearing boss I38 and carrying on its inner end a bevel pinion I39 which meshes with a. bevel gear- I48 mounted on a shaft IdI. The shaft MI is journaled in the partition walls I42 and I43 (Figure 8) of the housing E28, and on its opposite end carries a pinion I44 which meshes with a gear I85 mounted on one end of a shaft I48: likewise journaled in the partition walls I82 and I49 and parallel to the shaft MI.

Keyed to the shaft I48 (Figure 8) is a hub I41 carrying twin gears I48 and I49, the gear I 38 meshing with a gear I58 having a hub IESI journaled in the partition wall I43 and bored to loosely and rotatably receive the upper spline shaft 4i. Retaining nuts I52, I53 and I54 hold the shafts I89, ll and gear I58 in proper relative positions. The twin gear I4 9 in contrast meshes with an idler gear I85 mounted on a shaft I58 journaled in the partition wall I42 (Figure 7) and meshing with a gear I51, the hub I58 of which is journaled in the partition wall I42 and held in position by a retaining nut I88 and collar I88 (Figure 8). The gears I99 and I! on their ad J'acent faces are provided with jaw clutch teeth adapted to mesh with corresponding clutch teeth on the opposite ends of a sliding jaw clutch collar IEI which is keyed or splined to the upper spline shaft 4| and is annularly grooved to. re,- ceive the upper end of a shaft arm or yoke I82 mounted upon the inner end of a shaft I88. journaled in the housing I29 and carrying on its outer end. a shaft crank. I68 (Figure 7). In this manner the clutch collar IGI may be shifted to the fro along the upper spline shaft 4 I' to drive the latter in a forward or reverse direction depending on which of the gears I58 and IE1 is drivingly engaged by the clutch collar I6I at a given time.

The lower twin sprockets I39 (Figure 19) are mounted on a shaft I85 which is journaled in. a bearing boss I88 in the housing I28 and which has keyed to it a gear I61 meshing with a gear I88 mounted on a shaft I89. which is journaled at one end in a bearing boss I18 in the housing I28, and at its opposite end in a bracket I?! forminga part of the housing I26. The. shaft I69 carries a worm I72 which meshes with a. worm gear H18 mounted on a shaft I74, which is likewise journaled in the bearing bracket Ill and which at its other end has an enlarged toothed jaw clutch head H5 (Figure 8') with a socket I18. Mounted for free rotation in the socket I19 is the reduced diameter end of a shaft I11 which is: drivingly connected to the shaft I18. by a toothed sliding jaw clutch collar I18. The latter is keyed or splined to the shaft Ill and is annularly grooved for engagement by the upper end of a shift lever 519, so as to throw the teeth of the clutch collar I18 into or out of engagement with the teeth, on the clutch head I15.

The lever I19 is mounted on the inner end of a shaft I88 (Figure journaled in the housing I28 and on its outer endcarrying a hand crank I8I. The lower end of the lever I19 engages an annularly grooved slidable jaw clutch collar I82 keyed or splined to a shaft I83, the inner end of which is, loosely and rotatably supported in a socket. I84 in the end of a shaft I85 carrying a bevel gear I86 and journaled in the bearing bracket I1I. The jaw clutch collar I82 and bevel gear I88 carry interengageable clutch teeth which are engaged while the clutch teeth of the collar I18 and head I15 are disengaged and vice versa, due to the action of the shift lever I19. The bevel gear I86 is driven by a bevel pinion I81 mounted on the inner end of the shaft I65 (Figure 10). Thus, only one of the shafts I11 and I83 rotates at a given time but they are drivingly interconnected by a pinion I88 mounted on the shaft I11 and meshing with a gear I89 mounted on the end of the shaft I83 (Figure 8).

Keyed to the shaft I83 are spaced pinions I90 and I9I (Figure 8) The former meshes directly with a. gear I92 loosely and rotatably mounted on the lower spline shaft 42 and having its hub journaled in the partition wall I43. The pinion I9I, on theother hand, meshes with an idler pinion I93 which is loosely and rotatably mounted on a stud I94 threaded into the partition wall I42. The pinion I93 in turn meshes with a gear I95 the hub of which is journaled in the partition wall I42 (Figure 8) and which is bored for the passage of the lower spline shaft 42. The faces of the gears I92 and I95 are provided with jaw clutch teeth adapted to be engaged by corresponding jaw clutch teeth on the opposite ends of an annularly grooved sliding clutch collar I99 which is. engaged by a shift arm I91 mounted on a shaft I98 which is journaled in the housing boss I99 and carries on its outer end a hand crank 280 (Figure 10), Thus, by shifting the arm I91 and clutch collar I96 in one direction or the other, the lower spline shaft 42 may be driven either in a direct or reverse direction from the. shaft I83 and by shifting the shift lever I19 (Figure 8) in one direction or the other the shaft I83: may be driven at high speed or low speed, as desired, depending on whether a rapid traversing speed or a feeding speed is desired.

Meshing with the gears I92 and I95 respectively are gears 2M and 282 the hubs of which are journaled respectively in the partition walls I43. and I42 and are bored for the free passage of the screw shaft 48. Slidably mounted on the unthreaded portion of the screw shaft 43 between the gears 20I and 202 and keyed or splined to the shaft 43 is a toothed jaw clutch collar 283 (Figure 9) which is selectively engageable with similar clutch teeth on the faces of the gears ZBI and 282. The jaw clutch collar 283 is annularly grooved to. receive the upper end of a shifting arm 284, the. lower end of which is mounted on a shaft. 205; and carries a hand crank 286 By this. arrangement, the screwshaft 43 is drivingly connected either to the gear I92 or to the gear I95 for motion in a forward or reverse direction at high or lowspeed, depending on the setting of the shift lever I19 and clutch collars I18 and I82 (Figure 8) Slidably mounted on the lower spline shaft 42 is a toothed jaw clutch collar 28? (Figure 8) which is annularly grooved for engagement by the upper end of a shift arm 288, the lower end of which is mounted on a shaft 209 which is journaled in the housing I26 (Figure 10) and on its. outer end carries a hand crank 2IIl. The teeth of the clutch collar 201 are selectively engageable with similar clutch teeth on the lefthand end of the hub 2 (Figure 8) of a bevel gear U2. The hub 2II is bored to loosely and rotatably receive the spline shaft 42 and is, in

turn, journaled in the bearing bracket I'll.

.ture m in the sub-saddle 25.

The bevel gear 2I2 meshes with a bevel gear 2I3 mounted on a shaft 2M which is journaled in a flanged sleeve or collar 2I5 bolted into an aper- The sleeve 2'5 thus serves not only as a journal bearing for the shaft 2ft, but also as a hollow pivot shaft for the housing I26 around the sub-saddle 25. Bolted to the sub-saddle 25 is an angle bracket 2H, one arm of which is bored for the reception of the sleeve H5 and the other arm of which is bored to rotatably receive an internally threaded nut 2I8 which is threaded upon the screw shaft 22. The lower end of the shaft 2M carries a bevel pinion 2!!! which meshes with a bevel gear 220 on the end of the nut 2I8, which is held in position by a retaining collar 22I threaded upon the opposite end of the nut 2 l8. The lower spline shaft 42 and the screw shaft 43 are squared at their outer ends 222 and 223 respectively for the reception of a hand crank (not shown) for manually rotating the shafts.

Operation In the operation of the milling machines of this invention, let it be assumed that the bottom surface I5 of the dovetail groove It in the base 13 which receives the anvil of a power hammer I t has been deformed by long continued blows of the hammer and has to be resurfaced. Let it also be assumed that the angle brackets I2 which are adapted to be secured to the base It have been previously prepared and either previously and permanently secured where conditions permit or, where this is not possible, have been secured to the base I3 after the anvil has been removed in preparation for milling operations. The parallel rails I I are then mounted in parallel relationship upon the upper surfaces of the angle brackets I2 and secured in position by bolts or other suitable fasteners. The rails I I are made in various lengths to meet the requirements of the particular machine and are mounted not only parallel to each other but also parallel to the centerline of the base I3 of the machine It. The sub-saddles 25 and 26 and the driving mechanism unit and outer swivel support brackets 28 and 29 respectively are then mounted in the positions of Figures 1 and 2 on the upper surfaces of the rails II, slidably engaging the uide ribs 28. The cross-beam 30 is also secured in its proper position between the units 28 and 2t, with the cutter head carriage or saddle 3| reciprocably mounted thereon. The cutter head 32 is mounted in whichever of the vertical dovetail grooves 94% or 95 is best adapted to the milling operation to be performed. If the angle cutter head H5 is to be used to mill the side walls I? of the dovetail groove It, the cutter head 32 is placed in the vertical dovetail groove 94 (Figure 2) whereas, if the side wall I8 is to be machined, the cutter head H5 is mounted in the vertical dovetail groove 95.

With the parts properly lined up, as shown in Figures 1 and 2, let it be assumed that in order to position the cross-beam 30 properly to machine the dovetail groove It, the driving mechanism unit 28 and the outer swivel support bracket 29 have to be moved along the parallel rails I I. Before this is done, the nuts 35 are loosened so as to permit swiveling of these units on their subsaddles 25 and 26 and corresponding motion of the studs 34 in the arcuate slots 33.

Assuming that the various hand cranks are in their neutral positions, as shown in, the various .tive teeth (Figure 8) figures of the drawings, so that all of the clutches controlled thereby are likewise in their neutral positions, the operator starts the motor I25, thereby rotating the input shaft I3! and drive sprockets I33 of the driving mechanism unit 28, causing travel of the sprocket chains I34 and consequently imparting rotation to the shafts I4l,

TM and I85 (Figure 8).

The hand crank I8I is now shifted in one direction or the other to cause one of the clutch collars I18 or IE2 to be engaged with its respec- 7 If a rapid motion is desired, rather than. a slow feeding motion, the hand crank Itl is shifted downward to engage the clutch collar I82 with the teeth of the bevel clutch gear I85. By this clutching engagement, the shaft i533 is'started rotating, consequently rotating the clutch gears I98 and I9l at a relatively high or rapid traverse speed.

To rotate the lower spline shaft 42 other than manually, the operator shifts the hand crank 2% so as to move the jaw clutch collar I96 into clutching engagement with the teeth of the gear I912 (Figures 8, 9 and '10) if the shaft 32 is to be rotated in a forward direction. (If, however, the shaft 52 is to be rotated in a reverse direction, the operator shifts the clutch collar I96 into clutching engagement with the teeth of the gear 595.)

For forward rotation of the lower spline shaft 42, with the clutch collar Itfi engaged with the clutch gear I92, power is transmitted from the clutch gear I92 through the collar H95 to the lower spline shaft 42. To cause travel of the driving mechanism unit 28 along its rail II, the operator shifts the hand lever 2H] (Figures 8, 9 and 10) so that the clutch collar 2B! is engaged with the teeth on the end of the hub 2H of the bevel gear 2i2, causing rotation thereof and consequently causing rotation of the bevel gear ZIS, shaft Zl i, bevel gears H9 and 220, and the threaded nut 25%. As the threaded nut 2H8 ro- 2t and driving mechanism unit 28. When these have moved to their desired positions, the oper- I ator shifts the shift lever 2m in the reverse dimotion to disengage the clutch collar 29'! and move it into its neutral position, halting the rotation of the nut 2 I 8.

To similarly position the outer swivel bracket 25 and its sub-saddle, the hand crank l'l thereon (Figures 1 and 2) is shifted to bring the clutch collar it into clutching engagement with the toothed hub 58 of the bevel gear 59. Assuming the lower spline shaft 62 to be rotating in the manner described above, the rotation thereof will be imparted to the clutch collar (it, bevel gears 39 and 5|, shaft 52, bevel gears 5 and 55, and nut 58. The rotation of the nut 56 upon the stationary screw shaft 22 causes travel of the former along the latter and consequent travel of the subsaddle 2t and outer swivel support 29 along its rail II. The hand lever Q? and its clutch collar E i are then shifted back to their neutral positions. When the driving mechanism unit 28 and outer swivel support 29 have been thus properly positioned, the nuts 35 are tightened to lock each sub-saddle 25 or 2% to the unit 28 or 29 which it supports.

To move the cutter head carriage or saddle 3| along the cross-beam 38 so as to position the cutter head 32 properly with reference to the dovetail groove I S to be surfaced, the operator causes the screw shaft $3 to rotate in the proper ace oee direction and at a rapid traverse speed. Assuming that the motor I25 and input shaft l3l'are rotating as before, and that the hand crank l8| is shifted as before to rotate either the shaft l'il or the shaft I83, this rotation which, as previously stated, rotated the clutch gears I92 and H95 coaxial with the lower spline shaft 42 (Figure 8),

also rotates the clutch gears 20! and 202 co-axial with the screw shaft 53 and, as previously stated, meshing with the clutch gears I92 and H35 re- I spectively.

The operator now shifts the hand crank 20%- so as to shift the clutch collar 203 (Figures 9 and 10) into clutching engagement with the teeth of ure 11) mounted on the bottom plate 62 of the housing 60 of the cutter head saddle 3] causes the latter to travel along the cross-beam 30 at a rapid traverse speed. When the cutter head 32 has reached its desired position, the operator shifts the hand crank 206 and clutch collar 203 to its neutral position, halting the rotation of the screw shaft es and consequently halting the travel of the cutter head saddle or carriage 3 I.

The cutter head 32 is now moved up or down in its vertical dovetail groove 94 or 95 until the cutter H38 (Figures 4 and 11) is properly positioned with its cutting teeth I09 properly located with reference to the surface to be cut. The upper spline shaft ll is now started in rotation by shifting the hand crank I611 to engage its clutch collar [6| (Figure 8) either with the clutch gear I50 or with the clutch gear I51, depending upon whether forward or reverse rotation is desired for the spline shaft 4|. The spline shaft 4| therefore starts rotating as a result of its driving connection through the clutch collar Ni! and clutch gear J50 or I51 with the shaft I46 which,

' in turn, is driven from the shaft 14! through the gears Hi5 and M4. This action causes the cutter shaft NH to be rotated (Figure 11) through the gearing in the upper part of the housing 60 and the elongated pinion I62, rotating the milling cutter l 08.

To cause the carriage or saddle 3| and cutter head 32 to move at a feeding speed, the operator shifts the hand crank I 8| upward so that the clutch collar H8 is engaged with the teeth of the clutch head H5, thereby causing the shaft Ill (Figure 8) to be driven at a relatively slow feeding speed by reason of the speed reduction brought about by the engagement of the worm H2 with the worm gear I13 on the shaft I'M, rather than by the engagement of the bevel pinion I81 (Figure 10) with the bevel gear I86 on the shaft I85, as heretofore described. As a consequence, when the hand crank 206 and clutch collar 203 are appropriately shifted (Figure 10) either into clutching engagement with the forward clutching gear or the reverse clutching 7 gear 202, the screw shaft .3 is rotated at a slow i2 the lower spline shaft $2 or screw shaft 53 to rotate these by hand, such as where irregular surfaces are to be machined or indentations or recesses are to be entered.

When the surface has been completely machined and the side walls I? or 18 of the dovetail groove iii are to be machined (Figures 2 and 4), the operator removes the straight cutter head 32 and replaces it with the angle cutter head H5 (Figures 5 and 6). Having adjusted the angle cutter support [2! to the proper angle and clamped it in position by clamping screws or other clamping means (not shown), and thereby properly positioning the cutter I23 at the proper angle relatively to the work surface l! or l8 to be machined, the operator again applies power to the upper spline shaft GI and screw shaft 43 in the foregoing manner, causing the cutter I23 to make an appropriate out along the side wall 17 or E8. If these are inclined relatively to the center line of the machine bed or base I3, as in Figure 2, the operator may position the cro s-beam 30 along the line parallel thereto by repeating the procedure described above in connection with positioning the driving mechanism unit 28 and outer swivel support 23 on the rails H. The subsequent travel of the saddle or cutter head carriage 3| and the angle cutter head H5 in a direction parallel to the side wall surface I! or it? causes the latter to be properly out.

After the milling operations have been completed, the milling machine may be removed by reversing the installation procedure above. l"he anvil mat may then be reinstalled and use of the power hammer resumed, after having had its accuracy thus restored by the milling operations described above by the aid of the portable milling machine of this invention.

What 'I claim is:

1. A. portable milling machine comprising a pair of substantially horizontal separate elongated supports adap-ted to be positioned in laterally-spaced substantially parallel relationship on opposite sides of the area to be machined with an open space between said supports to give access to the area to be machined, a slide mounted for horizontal travel along each support, a bracket housing mounted on and traveling horizontally with one of said slides, a driving mechanism housing mounted on and traveling horizontally with the other of said slides, said slides being mounted on their supports for travel independently of and relatively to one another, both of said housings being pivotally mounted on their respective slides, a cross beam extending between said housings and traveling horizontally therewith, said cross beam having horizontal longitudinal'sliding engagement with one of said housings, a carriage horizontally slidably mounted on said cross beam, a cutter spindle rotatably mounted on said carriage, a prime mover, mechanism drivingly connecting said cutter spindle to said prime mover, said connecting mechanism being disposed at least partially within said driving mneehanism housing, mechanism for moving said carriage horizontally along said cross beam, and mechanism for moving said slides independently of one another horizontally along their respective supports.

2. A portable milling machine comprising a pair of substantially horizontal separate elongated supports adapted to be positioned in laterally-spaced substantially parallel relationship on opposite sides of the area to be machined 13 with an open space between said supports to give access to the area, said supports also being independently movable relatively to one another, a slide mounted for horizontal travel along each support, a bracket housing mounted on and traveling horizontally with one of said slides, a driving mechanism housing mounted on and traveling horizontally with the other of said slides, said slides being mounted on their supports for travel independently of and relatively to one another, both of said housings being pivotally mounted on their respective slides, a cross beam extending between said housings and traveling horizontally therewith, said cross beamhaving horizontal longitudinal sliding engagement with one of said housings, a carriage horizontally slidably mounted on said cross beam, a cutter spindle rotatably mounted on said carriage, a prime mover, mechanism drivingly connecting said cutter spindle to said prime mover, said connecting mechanism being disposed at least partially within said driving mechanism housing, mechanism for moving said carriage horizontally along said cross beam, and mechanism for moving said slides independently of one another horizontally along their respective supports.

3. A portable milling machine comprising a pair of substantially horizontal separate elongated supports adapted to be positioned in laterally-spaced substantially parallel relationship on opposite sides of the area to be machined with an open space between said supports to give access to the area to be machined, a slide mounted for horizontal travel along each support, a bracket housing mounted on and traveling horizontally with one of said slides, a driving mechanism housing mounted on and traveling horizontally with the other of said slides, said slides being mounted on their supports for travel independently of and relatively to one another, both of said housings being pivotally mounted on their respective slides, a cross beam extending between said housings and traveling horizontally therewith, said cross beam having horizontal longitudinal sliding engagement with one of said housings, a carriage horizontally slidably mounted on said cross beam, a cutter spindle rotatably mounted on said carriage, a prime mover, mechanism drivingly connecting said cutter spindle to said prime mover, said connecting mechanism being disposed at least partially within said driving mechanism housing, mechanism for moving said carriage horizontally along said cross beam,

and mechanism drivingly connected to said prime mover for moving said slides along their respective supports.

4. A portable milling machine comprising a pair of substantially horizontal separate elongated supports adapted to be positioned in latorally-spaced substantially parallel relationship on opposite sides of the area to be machined with an open space between said supports to give access to the area to be machined, a slide mounted for horizontal travel along each support, a bracket housing mounted on and traveling horizontally with one of said slides, a driving mechanism .housing mounted on and traveling horizontally with the other of said slides, said slides being mounted on their supports for travel independently of and relatively to one another, both of said housings being pivotally mounted on their respective slides, a cross beam extending between said housings and traveling horizontally therewith, said cross beam having horizontal longitu- 14 dinal sliding engagement with one of said hous ings, a carriage horizontally slidably mounted on said cross beam, a cutter spindle rotatably mounted on said carriage, a prime mover, mechanism drivingly connecting said cutter spindle to said prime mover, said connecting mechanism being disposed at least partially within said driving mechanism housing, mechanism for moving said carriage horizontally along said cross beam, and mechanism drivingly connected to said prime mover for moving said slides independently of and relatively to one another horizontally along their respective supports.

5. A portable milling machine comprising a pair of substantially horizontal separate elongated supports adapted to be positioned in latorally-spaced substantially parallel relationship on opposite sides of the area to be machined with an open space between said supports to receive the article to be machined, a slide mounted for horizontal travel along each support, a bracket housing mounted on and traveling horizontally with one of said slides, a driving mechanism housing mounted on and traveling horizontally with the other of said slides, a cross beam extending between said housings and traveling horizontally therewith, said cross beam loosely and slidably engaging one of said housings, a carriage slidably mounted on said cross beam, a cutter head mounted on said carriage, a cutter spindle rotatably mounted on said cutter head, a prime mover, mechanism drivingly connecting said outter spindle to said prime mover, said connecting mechanism being disposed at least partially Within said driving mechanism housing, and mechanism for moving said carriage horizontally along said cross beam, said carriage having cutter head mounting portions on opposite sides thereof and said cutter head being selectively and interchangeably attachable to either of said mounting portions.

6. A portable milling machine comprising a pair of substantially horizontal separate clon gated supports adapted to be positioned in latorally-spaced substantially parallel relationship on opposite sides of the area to be machined with an open space between said supports to receive the article to be machined, a slide mounted for horizontal travel along each support, a bracket housing mounted on and traveling horizontally with one of said slides, a driving mechanism housing mounted on and traveling horizontally with the other of said slides, a cross beam extending between said housings and traveling horizontally therewith, said cross beam loosely and slidably engaging one of said housings, a carriage slidably mounted on said cross beam, a cutter head mounted on said carriage, a cutter spindle rotatably mounted on said cutter head, a prime mover, mechanism drivingly connecting said cutter spindle to said prime mover, said connecting 'mechanism being disposed at least partially within said driving mechanism housing, and mechanism for moving said carriage horizontally along said cross beam, said carriage having verticallydirected guideways on opposite sides thereof and said cutter head being selectively and slidably mountable on either of said guideways.

7. A portable milling machine comprising a pair of substantially horizontal separate elongated supports adapted to be positioned in latorally-spaced substantially parallel relationship on opposite sides of the area to be machined with an open space between said supports to give access to the area to be machined, a slide mounted for horizontal travel along each support, a bracket housing mounted on and travelin horizontally with one of said slides, a driving mechanism housing mounted on and traveling horizontally with the other of said slides, said slides being mounted on their supports for travel independently of and relatively to one another, both of said housings being pivotally mounted on their respective slides, a cross beam extending between said housings and traveling horizontally therewith, said cross beam having horizontal longitudinal sliding engagement with one of said housings, a carriage horizontally slidably mounted on said cross beam, a cutter spindle rotatably mounted on said carriage, a prime mover, mechanism drivingly connecting said cutter spindle to said prime mover, said connecting mechanism being disposed at least partially within said driving mechanism housing, mechanism for moving said carriage horizontally along said cross beam, mechanism for moving said slides independently of one another horizontally along their respective supports, and speed reduction gearing in said driving mechanism housing drivingly interconnecting said prime mover and said mechanisms.

8. A portable milling machine comprising a pair of substantially horizontal separate elongated supports adapted to be positioned in laterally-spaced substantially parallel relationship on opposite sides of the area to be machined with an open space between said supports to give access to the area to be machined, a slide mounted for horizontal travel along each support, a bracket housing mounted on and traveling horizontally with one of said slides, a driving mechanism housing mounted on and traveling horizontally with the other of said slides, said slides being mounted on their supports for travel independently of and relatively to one another, both of said housings being pivotally mounted on their respective slides, a cross beam extending between said housings and traveling horizontally therewith, said cross beam having horizontal longitudinal sliding engagement with one of said housings, a carriage horizontally slidably mounted on said cross beam, a cutter spindle rotatably mounted on said carriage, a prime mover, mechanism drivingly connecting said cutter spindle to said prime mover, said connecting mechanism being disposed at least partially within said driving mechanism housing, mechanism for moving said carriage horizontally along said cross beam, mechanism for moving said slides independently of one another horizontally along their respective supports, and speed reduction and reverse gearing in said driving mechanism housing drivingly interconnecting said prime mover and said mechanisms.

9. A portable milling machine comprising a pair of substantially horizontal separate elongated supports adapted to be positioned in laterally-spaced substantially parallel relationship on opposite sides of the area to be machined with an open space between said supports to give access to the area to be machined, a slide mounted for horizontal travel along each support, a bracket housing mounted on and traveling horizontally with one of said slides, a driving mechanism housing mounted on and traveling horizontally with the other of said slides, said slides being mounted on their supports for travel in- '16 dependently of and relatively to one another, both of said housings being pivotally mounted on their respective slides, a cross beam extending between said housings and traveling horizontally therewith, said cross beam having horizontal longitudinal sliding engagement with one of said housings, a carriage horizontally slidably mounted on said cross beam, a cutter spindle rotatably mounted on said carriage, a prime mover, mechanism drivingly connecting said cutter spindle to said prime mover, said connecting mechanism being disposed at least partially within said driving mechanism housing, mechanism for -moving said carriage horizontally along said cross beam, mechanism drivingly connected to said prime mover for moving said slides along their respective supports, and speed reduction gearing in said driving mechanism housing drivingly interconnecting said prime mover and said mechanisms.

10. A portable milling machine comprising a pair of substantially horizontal separate elongated supports adapted to be positioned in laterally-spaced substantially parallel relationship on opposite sides of the area to be machined with an open space between said supports to give access to the area to be machined, a slide mounted for horizontal travel along each support, a bracket housing mounted on and traveling horizontally with one of said slides, a driving mechanism housing mounted on and traveling horizontally with the other of said slides, said slides being mounted on their supports for travel independently of and relatively to one another, both of said housings being pivotally mounted on their respective slides, a crossbeam extending between said housings and traveling horizontally therewith, said cross beam having horizontal longitudinal sliding engagement with one of said housings, a carriage horizontally slidably mounted on said cross beam, a cutter spindle rotatably mounted on said carriage, a prime mover, mechanism drivingly connecting said cutter spindle to said prime mover, said connecting mechanism being disposed at least partially within said driving mechanism housing, mechanism for moving said carriage horizontally along said cross beam, mechanism drivingly connected to said prime mover for moving said slides along their respective supports, and speed reduction and reverse gearing in said driving mechanism housing drivingly interconnect- 'ing said prime mover and said mechanisms.

HENRY EARL INIOR'TON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 808,563 Moore Dec. 26, 1905 2,245,553 Johnson June 17, 1941 2,405,856 Sohaerer Aug. 13, 19% 2,419,868 Yeomans et al Apr. 29, 194'. 2,434,751 Trecker et a1. Jan. 20, 1948 2,456,041 Barker Dec. 14, 1948 FOREIGN PATENTS Number Country Date 1,571 Great Britain June 9, 1865 257,202 Germany of 1913 495,866 France of 1919 519,102 Great Britain Mar. 15, 1940 

